Does a backwater valve need a clean-out access in an Orleans basement?

The City of Ottawa's backwater valve page says the valve must be located within the dwelling unit and accessible for inspection and maintenance. Ontario's Building Code (7.4.6.4) requires a backwater valve in a building drain to be of a "normally open" design and to serve no more than one dwelling unit. We found no separate clean-out rule for the valve; ask a licensed plumber how the access will be provided in your basement.

A few things worth knowing before the work starts. Plumber is a compulsory trade in Ontario under O. Reg. 876/21, so ask whether a licensed plumber does or signs off the plumbing part of the installation. The City of Ottawa requires a building permit before a backwater valve is installed, with floor plans and the device's location, type, make and model submitted with the application. The City's backwater valve page says to book an inspection 48 hours in advance. The City also notes that in older homes, especially those with cast iron pipes, rust can accumulate at the hinge and prevent the valve from closing properly during a surcharge event, so ask the plumber about the existing pipe.

On access more broadly: the City's protective plumbing FAQ says to look for a backwater valve between the last branch of the sewer line and where the pipe exits the foundation, and may look like a Y-shaped fitting with the branch plugged and pointing up. If yours is already in place and you are asking about an existing installation, ask the plumber whether it can be reached for inspection and maintenance.

Ask any contractor quoting the job to spell out in writing exactly what access provisions they are including, which Code clauses they are meeting, and who is pulling the permit.

If you want quotes from local contractors, the request form on this page sends your details to Ottawa waterproofing contractors listed in the Ottawa Construction Network directory.